Letter blank

Abstract

A letter blank has leading and trailing edges (1 and 2) and side edges (3 and 4). The blank includes a central oblong rectangular letter section (108) and a marginal edge section (205), the latter being joined by perforations (216) and carrying adhesive areas (218, 219 and 220). The letter section (108) can be folded into four portions (212, 213, 214 and 215) by folding along crease lines (9, 10 and 11), forming its own envelope which can be secured by means of the adhesive areas. In the folded configuration the shorter portions (213 and 214) are fully enclosed between the longer portions(212 and 215).

Having thus described the invention What is claimed is: 
     
       1. A letter blank having front and rear faces, said blank comprising: a substantially rectangular letter section having opposite sides with first opposed edges, and opposite ends with second opposed edges perpendicular to said first edges; and   at least a first pair of marginal edge strips of substantially constant width extending continuously, from end to end along said first pair of opposed edges of said letter section, said edge strips being joined to said letter section by respective rows of perforations enabling said edge strips to be torn away from said letter section; said letter blank including three mutually parallel crease lines which extend from side to side, parallel to said second pair of edges, to divide said blank into a top portion, a bottom portion, and two middle portions, said top and bottom portions being substantially identical to one another in size, and said two middle portions being substantially identical to one another in size, said middle portion being of the same width as said top and bottom portions and being substantially shorter, from end to end, than said top and bottom portions such that, when said letter blank is fan folded on said crease lines, with said top and bottom portions opposed and said middle portions disposed therebetween, said top and bottom portions completely enclose said middle portions and extend substantially beyond said middle portions to partially overlie each other directly; each of said marginal edge strips being provided with at least one adhesively coated area on said front face of said blank along at least one of said top and bottom portions, for securing the opposed top and bottom portions together, and each of said marginal edge strips being provided with at least one adhesively coated area on said rear face of said blank along at least one of said middle portions, for securing said two middle portions together, whereby contacting portions of said edge strips can be secured to one another with said blank fan folded, and whereby said edge strips can be torn away to thereby enable said letter section to be fully opened into a flat, rectangular sheet.